Table 216. Tamp Input/Output Pins; Table 217. Tamp Internal Input/Output Signals; Table 218. Tamp Interconnection - ST STM32WL55JC Reference Manual

Tamper and backup registers (TAMP)
The trade-off between tamper detection latency and power consumption through the pull-up
can be optimized by using TAMPFREQ to determine the frequency of the sampling for level
detection.
Note: Refer to the microcontroller datasheet for the electrical characteristics of the pull-up
resistors.
33.4 TAMP low-power modes
Mode
No effect.
Sleep
TAMP interrupts cause the device to exit the Sleep mode.
No effect on all features, except for level detection with filtering mode which remain active only when
the clock source is LSE or LSI.
Stop
Tamper events cause the device to exit the Stop mode.
No effect on all features, except for level detection with filtering mode which remain active only when
Standby
the clock source is LSE or LSI.Tamper events cause the device to exit the Standby mode.
No effect on all features, except for level detection with filtering mode which remain active only when
Shutdown
the clock source is LSE. Tamper events cause the device to exit the Shutdown mode.
33.5 TAMP interrupts
The interrupt channel is set in the interrupt status register. The interrupt output is also
activated.
Interrupt Interrupt
acronym event
TAMP Tamper x
Internal
TAMP
tamper y
1. The event flags are in the TAMP_SR register.
2. The interrupt masked flags (resulting from event flags AND enable control bits) are in the TAMP_MISR register.
3. The number of tampers and internal tampers events depend on products.
4. In case of level detection with filtering passive tamper mode, wakeup from Stop and Standby modes is possible only when
the TAMP clock source is LSE or LSI.
5. In case of level detection with filtering passive tamper mode, wakeup from Shutdown modes is possible only when the
TAMP clock source is LSE.
1038/1454
Table 219. Effect of low-power modes on TAMP
Table 220. Interrupt requests
(1)
Event flag
control bit
(3)
TAMPxF TAMPxIE
ITAMPyF ITAMPyIE
(3)
Description
Interrupt
Enable
clear
(2)
method
Write 1 in
CTAMPxF
Write 1 in
CITAMPxF
RM0453 Rev 2
Exit from
Exit from
Stop and
Sleep
Standby
mode
modes
(4)
Yes Yes
(4)
Yes Yes
RM0453
Exit from
Shutdown
mode
(5)
Yes
(5)
Yes